The singer's publicist said Boyle received a "rapturous" reception from the audience at Glasgow's SECC arena, just one day after she'd been advised to rest and skipped two shows in Manchester, England. Earlier this month, Boyle had been treated for exhaustion at a mental-health facility, following her surprise second-place finish on the show.

Spokesperson Nicola Phillips told the BBC that the crowd at the SECC broke into applause halfway through Boyle's performance of one of her signature songs, "Memory" from the musical "Cats." As she had on two previous tour dates, Boyle also sang the song that helped catapult her to unlikely worldwide fame, "I Dreamed a Dream" from the Broadway show "Les Misérables."

The Scottish Daily Record reported that the 9,000-strong crowd chanted "Susan, Susan," as the 48-year-old singer took the stage in a shimmery, metallic gray dress that made her look like "a million dollars in an outfit fit for a star."

According to reports, Boyle's performance Monday night went more smoothly than her two appearances on Saturday in Sheffield, England, where she appeared to stumble over the words to "Memory," drawing a mixed reaction from the audience.But in Glasgow, according to the Record, the crowd was roaring when Boyle went into her second song, then rose to their feet and chanted her name again as she finished the tune.

While ticketholders for Sunday's show were told they could get a full refund if they were angry that Boyle did not appear as promised, according to the BBC, only seven people had asked for their money back so far.

The "Talent" tour is slated to travel across the U.K. through the end of the month, and at press time Boyle was expected to appear on all remaining dates.